Invariably is an adverb which means each time or upon every occasion. If you see a particular person that you loathe and despise coming towards you and you always get that
sinking feeling in your stomach, then that is invariably what happens. You know that every time you see them they’ll have that
shit-eating grin on their face that each time you see it makes you feel sick, then that is invariably what happens as well. You know too, because it happens every time that, without even saying “Hello”, they’ll start
dishing the dirt on somebody because that is what invariably happens. I thought a few examples might help to clarify things, but I’m not invariably right.